8. [...]
If someone of us having known the constitutions of this council finds in his diocese a cleric or a monk resisting this beneficial teaching or perceive that this cleric or monk hides an error of the Priscillianist sect, and he does not excommunicate and condemn him, and then expel him from the Church, so that no one of the faithful shall eat together with him, let him know that anyone who receives such a man will be subject to excommunication and sentenced to divine punishment. [...]
(trans. by M. Szada)